{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "We used Photoactivatable - Ribonucleoside - Enhanced Crosslinking and Immunoprecipitation ( PAR - CLIP ) in HEK293 cells and identified a largely overlapping set of ~ 3000 mRNAs at ~ 9500 sites located in the 3 ' UTR and CDS ."}
{"Chemical": ["Ribonucleoside"]}